Synthesis of phenanthridine derivatives via cascade annulation of diaryliodonium salts and nitriles
作者:Jian Li、Hongni Wang、Jiangtao Sun、Yang Yang、Li Liu
DOI:10.1039/c4ob01504e
日期:——
A cascade coupling reaction toward a variety of phenanthridine derivatives has been developed. This cascade transformation proceeds via the copper-catalyzed coupling reaction of diaryliodonium salts and nitriles, and undergoes cyclization into the phenanthridine core.
A traceless directing group assisted Co-catalyzed C(sp2)–H carbonylation of ortho-arylanilines for the synthesis of free (NH)-phenanthridinones in metal-based-oxidant-free fashion was accomplished. This protocol employs diisopropyl azodicarboxylate as the CO source and oxygen as the sole oxidant, and provides good yields with various functional tolerance. The methodology has been applied for the total
Rhodium(I)-Catalyzed Aryl C–H Carboxylation of 2-Arylanilines with CO<sub>2</sub>
作者:Yuzhen Gao、Zhihua Cai、Shangda Li、Gang Li
DOI:10.1021/acs.orglett.9b01105
日期:2019.5.17
An unprecedented Rh(I)-catalyzed, amino-group-assisted C–H carboxylation of 2-arylanilines with CO2 under redox-neutral conditions has been developed. This reaction was promoted by a phosphine ligand with t-BuOK as the base and did not require the use of additional strong organometallic reagent. It enabled an efficient direct conversion of a broad range of 2-(hetero)arylanilines including electron-deficient
Tandem 6π-Azatriene Electrocyclization of Fused Amino-cyclopentenones: Synthesis of Functionalized Pyrrolo- and Indolo-quinoxalines
作者:Kapil Mohan Saini、Rakesh K. Saunthwal、Ankit Kumar、Akhilesh K. Verma
DOI:10.1021/acs.orglett.1c02782
日期:2021.10.1
A tandem 6π-azacyclization approach for the synthesis of diversified pyrrolo/indolo[1,2-a]quinoxalines from amino-cyclopentenones has been developed. The reaction proceeds through a trifluoroacetic-acid-mediated 6π-electrocyclization and concomitant opening of the cyclopentenone ring. The advantageous features of the developed chemistry include transition-metal-free conditions, operational simplicity
已经开发了一种用于从氨基环戊烯酮合成多样化吡咯并/吲哚[1,2- a ]喹喔啉的串联 6π-氮杂环化方法。该反应通过三氟乙酸介导的 6π-电环化和环戊烯酮环的伴随打开进行。所开发化学的优势特征包括无过渡金属条件、操作简单和广泛的底物范围。进一步的 X 射线晶体学研究证实了稠合杂环的指定结构。
A ruthenium-catalyzed free amine directed (5+1) annulation of anilines with olefins: diverse synthesis of phenanthridine derivatives
annulation between 2-aminobiphenyls and activated olefins is disclosed for succinct synthesis of valuable phenanthridine scaffolds. The protocol avails a common organic functional group, free amine, as a directing group and represents a unique combination of C–Hactivation/annulation/C–C bond cleavage cascade that bodes well in the production of bioactive alkaloids including trisphaeridine and bicolorine